What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey

What is Backdoor:Win32/Zegost.BZ infection?

In this article you will locate regarding the meaning of Backdoor:Win32/Zegost.BZ and also its negative effect on your computer. Such ransomware are a kind of malware that is specified by on the internet frauds to require paying the ransom money by a victim.

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Most of the cases, Backdoor:Win32/Zegost.BZ virus will instruct its sufferers to launch funds transfer for the objective of reducing the effects of the amendments that the Trojan infection has introduced to the sufferer’s gadget.

Backdoor:Win32/Zegost.BZ Summary

These alterations can be as complies with:

  • Creates RWX memory. There is a security trick with memory regions that allows an attacker to fill a buffer with a shellcode and then execute it. Filling a buffer with shellcode isn’t a big deal, it’s just data. The problem arises when the attacker is able to control the instruction pointer (EIP), usually by corrupting a function’s stack frame using a stack-based buffer overflow, and then changing the flow of execution by assigning this pointer to the address of the shellcode.
  • A process attempted to delay the analysis task.;
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • A process created a hidden window;
  • Unconventionial language used in binary resources: Chinese (Simplified);
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • The executable is compressed using UPX;
  • Deletes its original binary from disk;
  • Attempts to stop active services;
  • Attempts to repeatedly call a single API many times in order to delay analysis time. This significantly complicates the work of the virus analyzer. Typical malware tactics!
  • Installs itself for autorun at Windows startup.

    There is simple tactic using the Windows startup folder located at:
    C:\Users\[user-name]\AppData\Roaming\Microsoft\Windows\StartMenu\Programs\Startup Shortcut links (.lnk extension) placed in this folder will cause Windows to launch the application each time [user-name] logs into Windows.

    The registry run keys perform the same action, and can be located in different locations:

    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • Creates a hidden or system file. The malware adds the hidden attribute to every file and folder on your system, so it appears as if everything has been deleted from your hard drive.
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the files located on the sufferer’s hard disk drive — so the sufferer can no more use the data;
  • Preventing normal access to the target’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.
Similar behavior
Related domains


One of the most common channels whereby Backdoor:Win32/Zegost.BZ Ransomware are infused are:

  • By methods of phishing emails;
  • As a consequence of customer winding up on a source that hosts a malicious software program;

As quickly as the Trojan is successfully injected, it will certainly either cipher the data on the sufferer’s computer or prevent the gadget from functioning in a proper way – while additionally placing a ransom note that discusses the demand for the targets to effect the payment for the purpose of decrypting the papers or bring back the data system back to the preliminary condition. In the majority of instances, the ransom money note will show up when the client restarts the PC after the system has already been harmed.

Backdoor:Win32/Zegost.BZ distribution networks.

In different corners of the globe, Backdoor:Win32/Zegost.BZ expands by jumps and bounds. Nonetheless, the ransom notes as well as methods of obtaining the ransom money amount might vary depending on certain local (local) settings. The ransom notes and also methods of extorting the ransom money amount might differ depending on certain regional (regional) settings.

Ransomware injection

As an example:

    Faulty alerts about unlicensed software application.

    In particular areas, the Trojans frequently wrongfully report having actually found some unlicensed applications allowed on the sufferer’s tool. The alert then requires the user to pay the ransom money.

    Faulty statements about unlawful material.

    In countries where software program piracy is less preferred, this approach is not as efficient for the cyber fraudulences. Additionally, the Backdoor:Win32/Zegost.BZ popup alert may incorrectly declare to be originating from a police establishment as well as will certainly report having located youngster pornography or other prohibited data on the tool.

    Backdoor:Win32/Zegost.BZ popup alert may incorrectly claim to be deriving from a legislation enforcement institution and will certainly report having located youngster pornography or various other illegal information on the gadget. The alert will likewise consist of a requirement for the individual to pay the ransom.

Technical details

File Info:

crc32: 2E150E4A
md5: 61c7d5bda12819606c07aefcc46bf11b
name: jie.exe
sha1: 9169b77e5fa9afc8b4c38a2ce3e4829ca9ef5e5b
sha256: 551fde59b8efe2adcd372142aede63dd6be307f337ccba043fb7089b32d07a6d
sha512: dae76417b5bb5fc116a645fa9f6c29137bb5a7674872b31e62f6c3b0f96c12d5cb6d7b6a77c6f47ae507db32e6b7d1a1983d54f96dc748e15307732bf9771231
ssdeep: 1536:w/NYpDeeohStyDyeuYkium1QF5AyAvMFssgoMjid4xLnCYG0n80:w/NYtUStyCYHX1QwyWRsPMjG4LCYp
type: PE32 executable (GUI) Intel 80386, for MS Windows, UPX compressed

Version Info:

0: [No Data]

Backdoor:Win32/Zegost.BZ also known as:

GridinSoft Trojan.Ransom.Gen
DrWeb Trojan.KillProc.22090
MicroWorld-eScan Dropped:Trojan.GenericKD.32998577
CAT-QuickHeal Backdoor.Farfli.O
Qihoo-360 Win32/Trojan.92e
ALYac Dropped:Trojan.GenericKD.32998577
Zillya Trojan.Farfli.Win32.34049
Sangfor Malware
K7AntiVirus Trojan ( 0051a9ba1 )
BitDefender Dropped:Trojan.GenericKD.32998577
K7GW Trojan ( 0051a9ba1 )
Cybereason malicious.da1281
BitDefenderTheta AI:Packer.ACBB85FC1F
F-Prot W32/OnlineGames.HM.gen!Eldorado
ESET-NOD32 a variant of Win32/Farfli.DV
APEX Malicious
Avast Win32:Farfli-AX [Trj]
ClamAV Win.Dropper.Gh0stRAT-6992317-0
GData Dropped:Trojan.GenericKD.32998577
Kaspersky HEUR:Trojan.Win32.Farfli.gen
Alibaba Backdoor:Win32/Zegost.ee42dde7
NANO-Antivirus Trojan.Win32.KillProc.ctgocl
ViRobot Trojan.Win32.Z.Farfli.71680
AegisLab Trojan.Win32.Farfli.4!c
Tencent Malware.Win32.Gencirc.10b8ab0b
Ad-Aware Dropped:Trojan.GenericKD.32998577
Sophos Troj/Zegost-O
Comodo TrojWare.Win32.Farfli.LK@4pmigc
F-Secure Trojan.TR/Crypt.ZPACK.Gen2
VIPRE Trojan-Dropper.Win32.Farfli.e (v)
TrendMicro TROJ_GEN.R02DC0DA620
Emsisoft Dropped:Trojan.GenericKD.32998577 (B)
Ikarus Backdoor.Win32.Delf
Cyren W32/OnlineGames.HM.gen!Eldorado
Jiangmin Trojan.Generic.dirsu
Avira TR/Crypt.ZPACK.Gen2
Endgame malicious (moderate confidence)
Arcabit Trojan.Generic.D1F784B1
ZoneAlarm HEUR:Trojan.Win32.Farfli.gen
Microsoft Backdoor:Win32/Zegost.BZ
McAfee Artemis!61C7D5BDA128
MAX malware (ai score=87)
VBA32 BScope.Trojan.Downloader
Cylance Unsafe
Panda Trj/CI.A
TrendMicro-HouseCall TROJ_GEN.R02DC0DA620
Rising Dropper.Farfli!8.911 (CLOUD)
Yandex Trojan.Farfli!gdFo88Gn8ss
SentinelOne DFI – Malicious PE
eGambit Trojan.Generic
Fortinet W32/Magania.IKHG!tr
AVG Win32:Farfli-AX [Trj]
CrowdStrike win/malicious_confidence_80% (W)
MaxSecure Trojan.Malware.11374565.susgen

How to remove Backdoor:Win32/Zegost.BZ virus?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
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The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.2.

Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

Run the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.

Run Setup.exe

An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.

GridinSoft Anti-Malware Setup

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your system for Backdoor:Win32/Zegost.BZ files and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

GridinSoft Anti-Malware Scanning

Click on “Clean Now”.

When the scan has finished, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.

GridinSoft Anti-Malware Scan Result

Are Your Protected?

GridinSoft Anti-Malware will scan and clean your PC for free in the trial period. The free version offer real-time protection for first 2 days. If you want to be fully protected at all times – I can recommended you to purchase a full version:

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If the guide doesn’t help you to remove Backdoor:Win32/Zegost.BZ you can always ask me in the comments for getting help.

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  1. GridinSoft Anti-Malware Review from HowToFix site:
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About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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